I've been working on Joe's CNC plans for a few weeks now, just finished cutting all the wooden parts out tonight and assembling it, only thing left is to get the electronics and bearings come in the mail tomorrow. Posting here instead of in the Joe forum because my questions are more general though. I have tried searching for all these answers but am starting to get frustrated, this forum has so much info its hard (at least for me) to find the info I need.
1. What type of drill bit should I use on the router? I will be cutting wood, MDF and possibly plastics, simple machine parts, and possibly some 3d shapes. I found this bit of info "Remember: UPCUT bits provide fast chip ejection and deliver the finest finish on the lower surface of the workpiece. DOWNCUT are the best choice where an ultra-smooth finish on the upper surface is the highest priority." I don't get what it means by upper or lower
2. I don't have the electronic components yet, but I'm wondering how exactly how do you calibrate the machine, basically how it will know where it is and how far it moves etc?
3. Can I sell things I make with this machine or do I need special license besides the software ones?